ChemistryWhen looking at the Periodic Table, the oxidation state of hydrogen is +1; however my teacher told me that the net charge of hydrogen is 0. I do not understand why this is? Also, How may one calculate the charge of an element if only given the number of protons and neutrons (I...
November 8, 2011

mathFind a shortcut for computing the sum: 1+3+5+7++11+13+15+17=?? Explain your shortcut and how you could use this same shortcut to find the sum of all the odd numbers form 45 to 99.
March 14, 2011

math !!!! :O Courtneys mother is a nurse. She came to school to check out posture and out backs. She told us that about 4.6% of children have a problem called scoliosis. There are hundred twenty-five students in our school. If our school is like the average, how many children will ...
March 7, 2011

mathThe seventh book in the Harry Potter series has 759 pages. How many 2s were used when typing the page numbers?
January 8, 2011

MathSimon and Jimmy had 167 stamps altogether. Simon gave 4/7 of his stamps to Trina, and Jimmy gave 37 stamps to Trina. Simon and Jimmy had the same number of stamps left. How many stamps did Jimmy have in the beginning? Please Help ME: I need a formula
January 3, 2011

mathAndy had 20% fewer marbles than Henry. When Andy gave 80 marbles to Henry, the numbers of marbles he had left was half of what Henry had. How many marbles did Andy have in the begining? Please help me
December 9, 2010

math Andy had 20% fewer marbles than Henry. When Andy gave 80 marbles to Henry, the numbers of marbles he had left was half of what Henry had. How many marbles did Andy have in the begining? Please help me
December 9, 2010

11th gradeI NEED URGENT HELP!! Bob is riding his bike along at 2m/s and drops his 2kg backpack from a height of 1.5 meters. What is the backpacks resulting velocity when it strikes the ground?
December 8, 2010

physicsBob is riding his bike along at 2m/s and drops his 2kg backpack from a height of 1.5 meters. What is the backpacks resulting velocity when it strikes the ground?
December 8, 2010

mathuse properties of parallel lines to explain which angles in a parallelogram must be congruent???
December 2, 2010

mathuse properties of parallel lines to explain which angles in a parallelogram must be congruent???
December 2, 2010

mathuse properties of parallel lines to explain which angles in a parallelogram must be congruent???
December 2, 2010

Fine Artof the following, which was known as the golden age for japanese art? A. Sung Dynasty B. Ming Dynasty C. Kujaku Myo-o D. Heian
November 29, 2010

mathSevnety-eight players entered a single elimination tennis tournament.How many matches were played to determine the overall champ? please help me...and if u get the answer can you explain how you got it with a rule or a pattern
November 16, 2010

algebra 2Find the equation that is satisfied by the set of points such that the sum of the distances from the point to (2,0) and (-2,0) is 6. Express your answer in standard form.
June 2, 2010

chemCalculate the density of carbon monoxide gas at standard conditions if 25.0 mL of the gas weighs 0.0329 g at 800.00 mm of pressure???
May 26, 2010